iommu/vt-d: Add custom allocator for IOASID

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When VT-d driver runs in the guest, PASID allocation must be
performed via virtual command interface. This patch registers a
custom IOASID allocator which takes precedence over the default
XArray based allocator. The resulting IOASID allocation will always
come from the host. This ensures that PASID namespace is system-
wide.

Virtual command registers are used in the guest only, to prevent
vmexit cost, we cache the capability and store it during initialization.

Signed-off-by: Liu, Yi L <yi.l.liu@intel.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/20200516062101.29541-9-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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Jacob Pan 2020-05-16 14:20:51 +08:00 • committed by Joerg Roedel

parent 24f27d32ab

commit 3375303e82

3 changed files with 93 additions and 0 deletions

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1

drivers/iommu/dmar.c

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85

drivers/iommu/intel-iommu.c

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7

include/linux/intel-iommu.h

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